Prop diameter, pitch, blade numbe and gearing vs performance

[CommanderKeen]

Sorry for the newbie question.

I would like to know how different gearing, prop diameter, number of prop blades, and prop pitch affect performance. The microlight I am considering will have a Rotax 582. Standard gear ratio 2,58:1, optional 3:1 and 3,47:1. I am looking at the warp drive propellors with either 2, 3, 4 or 5 blades and in diameters 68", 70" or 72". As far as I can tell the prop pitch is ground adjustable, then fixed for the duration of the flight.

Can anyone assist with how all these variables will affect performance? I have heard that a higher gear ratio (4:1) with a 5 blade prop gives good take off performance, short ground roll, high climb rate, etc, but a substantially reduced top speed.

[KFA]

This is a very technical question that can not be meaningfully answered whithout all the relevant info.

What type of aircraft are we talking about?
What will it mainly be used for? Mission?

[CommanderKeen]

It is a Quicksilver Sport 2S. It will be used primarily for fun flying. I don't know yet if I need a better climb rate or better economy, or better speed, etc.

I want to know what combinations of the mentioned options will affect which performance parameters, and how. I am trying to understand how they go together to influence different performance parameters.

My question is general as I want as much info as possible not just what will give me best climb or best speed, etc.

[KFA]

As I said, it's a very technical discussion which I am willing to share over coffee... Ek kan nie so baie tik nie . My advise is to stick to what the manufacturer recommends. On this plane with it's high drag coeficient it would make little difference. Your topspeed is 70mph and your criuse 50-55mph so your speed range is small. The max prop size yo can use is a 72" if I am correct(Boom) so I would just stick to a standard 3,47 gearbox with a 2 or 3 blade fixed or ground adjustable prop 68 - 72 inch. I would go for a Warp 3 blade 72". You can cut it back and pitch it coarser if need be. More blades will not make a big difference, only adds weight. Keep it light and it will fly right.

[CommanderKeen]

Thank you for the reply. If i was in SA I would take you up on your offer for coffee and a discussion. Perhaps when i am back in August. I will probably only be looking to buy maybe early next year.

I have seen the same recommendation elsewhere, for a 3,47 gearbox and 72" 3 blade warp drive prop. At this stage it may what I will go for.